密钥交换 密钥协商
Key exchange, key agreement
以上为机器翻译结果，长、整句建议使用 人工翻译 。
陌生的双方在建立信任关系时，仅仅交换一次信任书，随后多次交换对称密钥，直到协商完成或者失败。
When a trust was established between strangers, their credentials were exchanged only once, and two parties exchanged the secret keys iteratively until the trust negotiation succeeded or failed.
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